GeneratorService: added "mapping" association configuration option that is required for correct loading of belongsTo associations from database
DeserializationAssociateRelationship: don't assume referencedColumnName to always be "id"
Raise php requirement to 5.4
Merge remote-tracking branch 'wakoch/master' into make_mapping_works

Conflicts:
	composer.json
merge with wakoch mapping feature
- add UseMapping annotation because everyone don't want to use mapping by default (i think so)
- add new annotation in Car Entity